WO2023095135A1 - Insert d'orientation d'écoulement pour faisceau tubulaire d'échangeur de chaleur - Google Patents

Insert d'orientation d'écoulement pour faisceau tubulaire d'échangeur de chaleur Download PDF

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Publication number
WO2023095135A1
WO2023095135A1 PCT/IL2022/051250 IL2022051250W WO2023095135A1 WO 2023095135 A1 WO2023095135 A1 WO 2023095135A1 IL 2022051250 W IL2022051250 W IL 2022051250W WO 2023095135 A1 WO2023095135 A1 WO 2023095135A1
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WO
WIPO (PCT)
Prior art keywords
insert
tube
tubes
bundle
heat exchanger
Prior art date
Application number
PCT/IL2022/051250
Other languages
English (en)
Inventor
Zvi Shtilerman
Original Assignee
Zvi Shtilerman
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zvi Shtilerman filed Critical Zvi Shtilerman
Publication of WO2023095135A1 publication Critical patent/WO2023095135A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
    • F28F1/22—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2245/00—Coatings; Surface treatments
    • F28F2245/06—Coatings; Surface treatments having particular radiating, reflecting or absorbing features, e.g. for improving heat transfer by radiation

Definitions

  • Heat pumps are well known for heating fluids and include a vaporizer where a refrigerant is vaporized typically by heat from air blown over vaporizer coils; a heat exchanger or condenser, where relatively cool fluid is heated upon thermal contact with the relatively hot refrigerant, the refrigerant condensing in the condenser and passing that heat energy to the fluid to be heated.
  • Heat pumps are efficient because about two thirds of the energy comes from the air, which is used to vaporize the liquid refrigerant in the vaporizer and about one third of the energy is required to compress the refrigerant in the gaseous state.
  • the energy used to condense the gaseous refrigerant is typically electrical energy while the energy to vaporize the liquid comes from the thermal energy in the ambient air.
  • Fig. 1 shows an exemplary prior art tube bundle 100 for a heat exchanger.
  • Bundle 100 includes a series of tubes 102 arranged in rows and columns.
  • a fluid, such as air, is flowed between the tubes.
  • the present presently disclosed subject matter relates to a tube bundle for heat exchangers; and a flow-directing insert therefor.
  • a heat exchanger tube-bundle of tube rows and tube columns including a flow-directing insert disposed between tube rows of the tubebundle.
  • the tube bundle for the heat exchanger includes at least two rows of heat exchanger tubes; and at least one fluid-flow directing insert disposed between the at least two rows of heat exchanger tubes.
  • the tubes are non-finned and oriented in an in-line configuration; and each of the inserts has a front wall, and upper and lower walls, which are shaped in correspondence to the heat exchanger tubes, to form one or more fluid flow passages.
  • the front wall of the insert is upwardly angled with respect to the vertical.
  • the tubes have an outer surface that is grooved or roughened.
  • the tube-bundle includes solid connections conductively connecting portions of the tubes and the inserts.
  • each tube column is formed in a one-piece serpentine configuration of a serpentine tube.
  • the insert and the tubes are non-uniformly distanced whereby the cross-sectional area of the fluid flow passages is non-uniform.
  • different columns of tubes have a different diameter and/or shape.
  • the front wall of the insert has a solar absorbing material. In some examples, the solar absorbing material is a black coating.
  • a flow-directing insert for a heat-exchanger tube bundle having non-finned tubes oriented in an in-line configuration includes a front wall; an upper wall; and a lower wall.
  • the upper and lower walls of the insert are shaped in correspondence to the heat exchanger tubes, thereby forming a fluid flow passage based on the shape of the upper and lower walls of the insert.
  • the front wall of the insert is upwardly angled with respect to the vertical.
  • the insert includes solid connections to allow conductive connection to the tubes of the tube bundle.
  • the insert is configured to form a non-uniform distance between the insert and the tubes whereby the cross-sectional area of the fluid flow passage is non-uniform.
  • the front wall of the insert has a solar absorbing material.
  • the solar absorbing material is a black coating.
  • an inter-tube row, flow directing, insert for a nonfinned tube heat exchanger tube-bundle is provided.
  • FIG. 1 is a perspective view of an exemplary prior art tube bundle for a heat exchanger.
  • FIGs. 2-4 are a perspective view; a cross-sectional side view; and a cross-sectional end view, respectively, of a tube bundle with a flow-directing tubebundle insert, in accordance with one example of the presently disclosed subject matter.
  • FIG. 5 is a side view of an exemplary flow-directing tube-bundle insert, in accordance with one example of the presently disclosed subject matter.
  • FIG. 6 is a cross-sectional view of an exemplary line of tubes (a front tube and subsequent tubes), in accordance with examples of the presently disclosed subject matter.
  • FIG. 7 is a cross-sectional view of an exemplary insert-tube arrangement, in accordance with examples of the presently disclosed subject matter.
  • FIG. 2 shows a tube bundle 20, in accordance with one example of the presently disclosed subject matter, illustrated with two in-line tube rows of tubes 22, illustrated as a sixteen “highVcolumn configuration.
  • Fig. 3 shows a cross-section of a portion of the side of tube bundle 20, with columns of only a few “high” configuration; and
  • Fig. 4 shows an end cross-section view of Fig. 3.
  • the rows of tubes 22 of tube bundle 20 have an in-line arrangement I configuration; in other words, exemplified in Fig. 4, as having an upper tube row of tubes 24a and 26a; an intermediate tube row of tubes 24b and 26b; and a lower tube row of tubes 24c and 25c.
  • Tube bundle 20 may include additional tube rows, and any suitable number of tubes in each row).
  • the three tube rows and two tube “columns” are only illustrative/exemplary - the number of tubes is not limited.
  • Intermediate to each tube row are a series of fluid flow-directing tube-bundle inserts 28.
  • Tube bundle 20 typically has a fan (not illustrated) on the rear side (left side in Fig. 4) to draw air over tubes 22, i.e. draw air between the tube-rows thereof - in fluid/air passages 40, noted below.
  • Fig. 5 illustrates an exemplary design of flow-directing insert 28 including an upper wall 34, a lower wall 36, and a front wall 38 - the walls having a thickness T.
  • upper wall 34 and lower wall 36 are shaped to correspond to tubes 22 adjacent thereto.
  • This correspondence provides a fluid flow passage 40 that may be generally uniform in cross-sectional area, as illustrated in Fig. 4, and that is narrow relative to (narrower than) the intertube row space without inserts 28.
  • insert 28 can be designed wherein the correspondence provides a non-uniform flow passage, for example, having a larger (or smaller, or even non-linear) cross sectional flow area at the front portion of passage 40 compared to the rear portion of the passage.
  • Such deviations from a uniform cross-sectional flow area may be advantageous depending on the change in temperature of the fluid as the fluid exchanges heat while passing over the tubes. It should be understood that the fluid-flow area of passages 40 are smaller than the fluid flow area without inserts 28.
  • Front wall 38 of insert 28 serves to block fluid, whereby the fluid is restricted to only flow in passages 40 to thereby control/limit the cross-sectional fluid flow area. As such, heat exchange between the fluid/air and tubes 22 is improved.
  • the outer surface of front walls 38 of each insert 28 may be coated with a solar absorbing material - e.g. black colored; and the front walls may be angled to better face toward the sun, as illustrated in Fig. 2, Fig. 4, and Fig. 7.
  • the evaporator as a whole may be angled so that front walls 38 better face toward the sun (e.g., at a 30 to 60 degree angle).
  • This angling of front wall 38 of insert 28 is with respect to the vertical so that the front wall faces more upward than horizontal.
  • the solar absorbing material e.g. black coating
  • inserts at the top and bottom may be “partial” (e.g. “half”) inserts, identified as top insert 28t and bottom insert 28b.
  • Fig. 6 illustrates an option where tubes 22 of tube rows subsequent to (downstream of) the “front” tube rows 24, are “smaller” than the tubes in the front tube row.
  • “smaller” means that when viewed from the fluid flow direction, the subsequent tubes 26a, 26b, and 26c appear smaller.
  • tubes 22 of subsequent tube rows may have varied shapes / geometries, typically for increased heat transfer area, for example in the form of an oval tube 60 (with their longer dimension in the fluid flow direction.
  • tubes 22 in a further subsequent tube row e.g., tube row 27
  • tubes 29 with projections 62 may be provided.
  • tubes 22 may be grooved/roughened on their inner walls to improve heat transfer. It is also known to groove/roughen the outer surface of heat exchanger tubes, although that may not be convenient with all prior art heat exchanger/tube bundle designs. However, the designs described herein may be conveniently used with tubes having grooved/roughened outer surfaces.
  • the outer grooves/bumps could be helical (i.e., have a spiral configuration; not in a straight/cylindrical line) to further enlarge the heat transfer surface area.
  • Fig. 7 shows an exemplary optional arrangement between insert 28 and tubes 22 wherein in certain locations there are solid connections 70 between limited portions of the insert and the tubes for improved heat exchange due to the conduction.
  • Solid connections 70 provide a conductive contact at those limited portions between inserts 28 and tubes 22.
  • Connections 70 may be a part of insert 28, to allow the conductive connection with tubes 22.
  • Connections 70 are typically “downstream” of the air-flow inlet (i.e. not adjacent front wall 38; in other words tubes 26 or subsequent tubes). In such subsequent tubes 26 (and/or 27), the air/fluid is colder than in the front of tube bundle 20, which receives fresh “warm” air. As the air is cooled, its density/volume is smaller so the flowrate may be kept more uniform.
  • each tube column can be formed of one tube by bending in a serpentine configuration rather than requiring welding/soldering of end U-shaped turn- about/arch at the ends of linear tubes.
  • tubes 24a, 24b, and 24c (the front “tube column”) can be made of one tube; a one-piece configuration - the same for tubes 26a, 26b, and 26c (the second “tube column”).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

La présente invention concerne un insert d'orientation d'écoulement de fluide pour un faisceau tubulaire d'un échangeur de chaleur, le faisceau comprenant au moins deux rangées de tubes d'échangeur de chaleur. L'insert présente une paroi avant ; et présente des parois supérieure et inférieure conçues en correspondance avec la forme des tubes, pour délimiter un passage d'écoulement de fluide.
PCT/IL2022/051250 2021-11-26 2022-11-23 Insert d'orientation d'écoulement pour faisceau tubulaire d'échangeur de chaleur WO2023095135A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202163283302P 2021-11-26 2021-11-26
US63/283,302 2021-11-26

Publications (1)

Publication Number Publication Date
WO2023095135A1 true WO2023095135A1 (fr) 2023-06-01

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Application Number Title Priority Date Filing Date
PCT/IL2022/051250 WO2023095135A1 (fr) 2021-11-26 2022-11-23 Insert d'orientation d'écoulement pour faisceau tubulaire d'échangeur de chaleur

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289871A (en) * 1991-11-11 1994-03-01 Erno Raumfahrttechnik Gmbh Evaporation heat exchanger, especially for a spacecraft
JPH11264677A (ja) * 1998-03-18 1999-09-28 Ishikawajima Harima Heavy Ind Co Ltd 直交流形バヨネット熱交換器
US20100116478A1 (en) * 2008-11-12 2010-05-13 Exxonmobil Research And Engineering Company Displaceable baffle for a heat exchanger and method for reducing vibration for the same
US20130276773A1 (en) * 2012-04-18 2013-10-24 Solight Solar, Inc. Solar Thermal Collectors and Thin Plate Heat Exchangers for Solar Applications

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289871A (en) * 1991-11-11 1994-03-01 Erno Raumfahrttechnik Gmbh Evaporation heat exchanger, especially for a spacecraft
JPH11264677A (ja) * 1998-03-18 1999-09-28 Ishikawajima Harima Heavy Ind Co Ltd 直交流形バヨネット熱交換器
US20100116478A1 (en) * 2008-11-12 2010-05-13 Exxonmobil Research And Engineering Company Displaceable baffle for a heat exchanger and method for reducing vibration for the same
US20130276773A1 (en) * 2012-04-18 2013-10-24 Solight Solar, Inc. Solar Thermal Collectors and Thin Plate Heat Exchangers for Solar Applications

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